optic chiasm

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Related to chiasma opticum: Nucleus caudatus

chiasm

 [ki´azm]
a decussation or X-shaped crossing.
optic chiasm a structure in the forebrain formed by the decussation of fibers of the optic nerve from each half of each retina.

op·tic chi·asm

[TA]
a flattened quadrangular body in front of the tuber cinereum and infundibulum, the point of crossing or decussation of the axons of the optic nerves. Axons from the nasal retina cross to the opposite side, whereas axons from the temporal retina run directly caudal without crossing; some pass transversely on the posterior surface between the two optic tracts, and others pass transversely on the anterior surface between the two optic nerves.

optic chiasm

Etymology: Gk, optikos, sight, chiasma, crossed lines
a point near the thalamus and hypothalamus where parts of each optic nerve cross over.

op·tic chi·asm

(op'tik kī'azm) [TA]
A flattened quadrangular body in front of the tuber cinereum and infundibulum, the point of crossing or decussation of the fibers of the optic nerves; most of the fibers cross to the opposite side, some run directly forward on each side without crossing, some pass transversely on the posterior surface between the two optic tracts and others pass transversely on the anterior surface between the two optic nerves.
Synonym(s): optic decussation.

op·tic chi·asm

(op'tik kī'azm) [TA]
A flattened quadrangular body in front of the tuber cinereum and infundibulum, the point of crossing or decussation of the fibers of the optic nerves.
Synonym(s): optic decussation

optic chiasm (op´tik kī´azm),

n a point near the thalamus and hypothalamus at which portions of each optic nerve cross over.

chiasm

a decussation or Y-shaped crossing.

optic chiasm
a structure in the forebrain formed by the decussation of fibers of the optic nerve from each half of each retina.